Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08171 Media Support Critical (emulation) Always 13 days ago 10 days ago
Tester ArcadeShadow View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Acknowledged Driver ibmpc.cpp
Version 0.239 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary MESS-specific 08171: [ibm5170] lemmings: Floppy disk emulation
Description The lemmings game has a copy protected floppy disk track. The game worked until Mame 0.211 version. From 0.212 version, MAME's floppy disk emulation doesn't recognize the protected track of the floppy disk.
Steps To Reproduce
Additional Information
Github Commit
Regression Version 0.211
Affected Sets / Systems [ibm5170] lemmings
Attached Files
There are no relationship linked to this issue.
User avatar
11 days ago
Can you tell me exactly how (from command line) you are loading this and what machine are you using to do so for I can see it working in 0.211 and not working in current? Also, are there additional steps needed to start it or is it something autobooting?

I did note that in current hashes, the image itself is listed as not working (preliminary) in ibm5150. Are you sure since there is a lemmings entry in both ibm5170 and ibm5150, it isn't confusing them?
User avatar
11 days ago
I'm using the machine [at386] with 2 floppy disk drives and one hard disk The game isn't autoboot, you need to start the machine with a hard disk with MS DOS or a MS DOS disk inserted. those are the slot devices that I have configured:
board1:fdcsmc:fdc:0 35hd
board1:fdcsmc:fdc:1 525dd

The game was added wrongly to the ibm5150 software list in this last MAME version, I commented that on the PR (because it is already in the ibm5170).
I added the game in the ibm5170 software list, on the MAME 0.206 version and it worked until 0.211.
From 0.212 the game shows the message that the floppy disk needs to be inserted in the drive.
User avatar
10 days ago
It's likely that caused this. I think that only OG is going to be able to fix it.